697902221 has 2 divisors, whose sum is σ = 697902222. Its totient is φ = 697902220.

The previous prime is 697902203. The next prime is 697902259. The reversal of 697902221 is 122209796.

It is an a-pointer prime, because the next prime (697902259) can be obtained adding 697902221 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355134025 + 342768196 = 18845^2 + 18514^2 .

It is a cyclic number.

It is not a de Polignac number, because 697902221 - 2⁶ = 697902157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697202221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348951110 + 348951111.

It is an arithmetic number, because the mean of its divisors is an integer number (348951111).

Almost surely, 2^697902221 is an apocalyptic number.

It is an amenable number.

697902221 is a deficient number, since it is larger than the sum of its proper divisors (1).

697902221 is an equidigital number, since it uses as much as digits as its factorization.

697902221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 697902221 is about 26417.8390675695. The cubic root of 697902221 is about 887.0161493001.

The spelling of 697902221 in words is "six hundred ninety-seven million, nine hundred two thousand, two hundred twenty-one".